LDPC Transmission Mapping and Interleaving for Error Floor Control
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Solution Overview
Problem
Current data transmission methods using LDPC codes face challenges in maintaining favorable communication quality, particularly in ensuring reliable error correction and avoiding the error floor phenomenon in decoding characteristics.
Innovation Solution
The proposed solution involves a transmission method that performs LDPC coding with specific parity check matrices, group-wise interleaving, and mapping to uniform constellation points in QPSK, utilizing a detailed parity check matrix structure to enhance communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LDPC coding is performed with conventional parameters, then data transmission can be implemented, but communication quality is insufficient and error floor phenomenon occurs
Solution Approach 1:
The patent applies parameter changes by optimizing specific LDPC code parameters including setting code length N to 64800 or 69120 bits, coding rate r to specific values (2/16, 3/16, 4/16, 5/16), and configuring the parity check matrix with specific dimensions (M1=1800 rows, K columns for information bits, N-K columns for parity bits). These parameter optimizations resolve the contradiction by achieving superior error correction performance and eliminating the error floor phenomenon while maintaining practical system implementation.
2Reliability
If group-wise interleaving is performed with standard configuration, then data can be transmitted, but error correction performance is suboptimal
Solution Approach 1:
The patent applies segmentation by dividing the LDPC code into multiple bit groups of 360 bits each (192 groups total for 69120-bit code). The group-wise interleaver permutes these bit groups according to a specific permutation table, creating an optimized sequence that enhances error correction performance. This segmentation approach resolves the contradiction by improving reliability through structured reorganization while keeping the interleaving operation computationally efficient.
3Productivity
If uniform constellation QPSK mapping is used, then signal points can be transmitted, but mapping efficiency needs optimization
Solution Approach 1:
The patent applies parameter changes in the mapping stage by using uniform constellation (UC) QPSK modulation with specific mapping rules. The LDPC code bits are mapped to QPSK signal points according to a defined mapping table that optimizes the distribution of signal points in the complex plane. This approach resolves the contradiction by achieving both high mapping efficiency (4 bits per symbol) and maintained communication quality through the uniform distribution properties of UC-QPSK.
Data Source
AI summary
The present technology relates to a transmission method and a reception device for securing favorable communication quality in data transmission using an LDPC code. In group-wise interleaving, the LDPC code with a code length N of 69120 bits is interleaved in units of 360-bit bit groups. In group-wise deinterleaving, a sequence of the LDPC code after group-wise interleaving is returned to an original sequence. The present technology can be applied, for example, in a case of performing data transmission using an LDPC code, and the like.